CCNA - Network Vocab
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| 4b/5b | show 🗑
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| show | a 1-bit flag in the tcp header that indicates the acknowledgment field is valid.
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| acknowledgment | show 🗑
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| acknowledgment number | show 🗑
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| show | the range of ip addresses that can be assigned by the DHCP server.
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| Address resolution protocol | show 🗑
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| show | an IPv4 multicast address that is restricted to a local group or organization
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| AND | show 🗑
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| argument | show 🗑
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| ARP cache | show 🗑
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| show | a technique used to attack an ethernet network by sending fake ARP messages to an ethernet LAN. These frames contain false MAC addresses that confuse network devices
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| ARP table | show 🗑
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| show | a number used in the 802.11 header to specify the session between a wireless client and the access point.
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| show | communication that does not use a common clock between the sender and receiver. To maintain timing
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| attenuation | show 🗑
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| authentication | show 🗑
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| authoritative | show 🗑
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| backoff algorithm | show 🗑
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| show | In networking
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| best effort | show 🗑
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| binary | show 🗑
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| show | binary digit used in the binary numbering system. Binary digits are units of information storage and communication in computing. Each bit can be either a 0 or a 1.
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| show | the time required to send a single bit over some transmission medium. The time can be calculated at 1/speed
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| show | a device that connects multiple network segments at the data link layer of the OSI model. Bridges were the predecessor to LAN switches.
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| show | the table used by a switch or bridge that associates MAC addresses with the outgoing port. The switch or bridge uses this table for its forwarding/filtering decisions.
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| show | the process of forwarding frames in a switch or a bridge from one port to another port or from segment to segment
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| show | a form of transmission where one device transmits to all devices within the network or on another network
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| broadcast address | show 🗑
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| show | a logical network composed of all the computers and networking devices that can be reached by sending a frame to the data link layer broadcast address.
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| burned in address | show 🗑
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| cache | show 🗑
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| show | a signal on a medium used to support the transmission of data. Data is carried over the medium by modulation.
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| carrier sense multiple access (CSMA) | show 🗑
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| show | The MAC algorithm used by ethernet devices in a shared media. The protocol requires a node wishing to transmit to listen for a carrier signal before trying to send. If a carrier is sensed
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| channel | show 🗑
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| channel service unit/data service unit | show 🗑
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| classful addressing | show 🗑
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| show | an IPV4 addressing scheme that uses a subnet mask that does not follow classful addressing limitations. It provides increased flexibility when dividing ranges of IP addresses into separate networks. Classless addressing is considered the best in current n
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| show | a network device that accesses a service on another computer remotely by accessing the network.
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| cloud | show 🗑
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| show | a grouping of code that meets a certain
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| show | Information systems that allow the creation of a document or documents that can be edited by more than one person in real time
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| collision | show 🗑
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| collision domain | show 🗑
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| show | communication where the sender and receiver must prearrange for communications to occur; otherwise
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| connectionless | show 🗑
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| console port | show 🗑
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| control data | show 🗑
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| show | another form of the root word converge in the phrase converged network. This kind of network aggregates various forms of traffic such as voice
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| cyclic redundancy check | show 🗑
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| show | a computer program that runs in the background and is usually initiated as a process. Daemons often support server processes.
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| show | the devices and connections of a communications network that comprise the network end of the user to network interface. The DCE provides a physical connection to the network
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| show | devices at the user end of a user-network interface that serves as a data source
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| show | a process by which an end device
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| default gateway | show 🗑
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| show | Routing table entry that is used to direct frames for which a next hop is not explicitly listed in the routing table. This route is used to forward a packet when no other known route exists for a give packet's destination address.
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| show | this field of a frame signals the beginning or end of a frame.
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| show | the layer 3 address to which the data is going.
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| deterministic | show 🗑
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| show | also known as boolean algebra. These consist of the AND OR and IF operations
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| show | a term that describes IPv4 packets sent to all hosts in a particular network. In a directed broadcast
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| directly connected network | show 🗑
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| dispersion | show 🗑
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| show | a method of computer processing in which different parts of a program run simultaneously on two or more computers that are communicating with each other over a network
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| show | the client part of the DNS client server mechanism. A DNS resolver creates queries sent a across a network to a same server
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| show | a name
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| domain name system | show 🗑
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| show | a convention for writing IP addresses with four decimal numbers
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| download | show 🗑
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| dynamic host configuration protocol | show 🗑
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| dynamic or private ports | show 🗑
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| dynamic routing | show 🗑
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| show | interface by magnetic signals caused by the flow of electricity. EMI can cause reduced data integrity and increased error rates on transmission channels. The physics of this process are that electrical current creates magnetic fields
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| show | unencrypted password used to allow access to privledge EXEC mode from IOS user EXEC mode.
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| show | the process by which a device adds networking heads and trailers to data from an application for the eventual transmission of the data onto a transmission medium.
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| encode | show 🗑
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| encryption | show 🗑
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| show | a device such as a desktop or mobile device that is used by an end user.
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| ethernet PHY | show 🗑
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| show | a network topology characterized by a central location connected to multiple hubs. In an extended star
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| show | part of a company's intranet that is extended to users outside the company
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| show | a common name for ethernet technology that operates at 100 mbps.
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| fault tolerance | show 🗑
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| show | physical medium that uses glass or plastic threads to transmit data. A fiber-optic cable consists of a bundle of these threads
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| fiber optics | show 🗑
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| show | in ethernet
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| show | a 1-bit field in the TCP header that is used by a device that wants to terminate its session with the other device. This is done by inserting the FIN flag in the flag field found in the TCP segment
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| show | any combination of hardware device and/or software application designed to protect network devices from outside network users and/or malicious applications and files.
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| flash | show 🗑
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| show | a process used by a switch or bridge to forward broadcasts and unknown destination unicasts. The bridge/switch forwards these frames out all ports except the port on which the frame was received.
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| flow control | show 🗑
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| show | In ethernet
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| show | the dividing of IP datagrams to meet the MTU requirement of a layer 2 protocol.
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| frame | show 🗑
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| full duplex | show 🗑
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| gateway | show 🗑
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| show | ethernet that transmits data at 1
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| global configuration mod | show 🗑
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| globally scoped addresses | show 🗑
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| goodput | show 🗑
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| half duplex | show 🗑
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| show | an addressing scheme in which a network is partitioned into sections
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| high-order bit | show 🗑
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| hop | show 🗑
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| show | a network device that has an IPv4 address assigned to it to communication over a network.
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| show | IPv4 address of a network host. When talking about host addresses
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| show | a group defined by a class D address (multicast
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| hub | show 🗑
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| show | a network that incorporates both optical fiber along with coaxial cable to create a broadband network. commonly used by cable tv companies.
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| hypertext transfer protocol | show 🗑
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| instant messaging | show 🗑
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| show | An international
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| interframe spacing | show 🗑
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| show | a device that connects end devices to the network or interconnects different networks. A router is an example of an intermediary device.
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| International Organization for Standardization | show 🗑
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| Internet | show 🗑
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| show | An organization that assigns the numbers important to the proper operation of the TCP/IP protocol and the Internet
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| Internet backbone | show 🗑
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| Internet control message protocol | show 🗑
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| show | The standards body responsible for the development and approval of TCP/IP standards
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| show | A company that helps create the Internet by providing connectivity to enterprises and individuals
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| show | a combination of many IP subnets and networks
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| Interpret as command | show 🗑
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| intranet | show 🗑
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| show | Network layer protocol in the TCP/IP stack offering a connectionless internetwork service. IP provides features for addressing
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| show | a 32-bit number
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| show | the header defined by the IP. Used to create IP packets by encapsulating data supplied by higher-layer protocol (such as TCP) behind an IP header.
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| show | in a shared media ethernet network
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| show | Used in the CLI following the command. Keywords are parameters that are used with the command from a set of predefined values.
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| kilobits per second | show 🗑
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| latency | show 🗑
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| layered model | show 🗑
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| show | a broadcast that is sent to a specific network or series of networks.
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| limited scope address | show 🗑
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| link-local address | show 🗑
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| local area network | show 🗑
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| locally administered address | show 🗑
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| Logical link control | show 🗑
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| logical network | show 🗑
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| logical topology | show 🗑
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| loopback | show 🗑
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| low-order bit | show 🗑
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| show | on a switch
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| Mail user agent | show 🗑
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| show | line code in which each bit of data is signified by at least one voltage level transition.
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| show | the largest IP packet size allowed to be sent out a particular interface. Ethernet interfaces default to an MTU of 1500 because the data field of an Ethernet frame should be limited to 1500 bytes
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| media access control | show 🗑
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| show | the networking layers whose processes are not affected by the media being used. In ethernet
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| show | The normal operation of ethernet ports on a hub. In this mode
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| media-dependent interface crossover | show 🗑
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| show | a network with a geographic size between a LAN and a WAN. Typically used by service providers to create a highspeed network in a major metropolitan area where many customers might want high speed services between large sites around a city.
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| show | the bit position in a binary number having the greatest value. The most significant bit is sometime referred to as the leftmost bit.
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| multicast client | show 🗑
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| multicast group | show 🗑
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| show | a process where multiple digital data streams are combined into one signal.
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| show | 1.collection of computers
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| network address | show 🗑
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| Network address translation (NAT) | show 🗑
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| show | a collection of data that establishes a reference for network performance and behavior over a period of time. This reference data is used in the future to assess the health and relative growth of network utilization.
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| show | computer hardware
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| show | a part of a computer network that every device communicates with using the same physical medium. Network segments are extended by hubs or repeaters.
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| show | a protocol for synchronizing the clocks of computer systems over packet-switch data networks. NTP uses UDP port 123 as its transport layer.
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| show | data link layer term describing a device connected to a network.
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| noise | show 🗑
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| show | line code in which 1s are represented by one significant condition and 0s are represented by another.
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| nonvolatile RAM (NVRAM) | show 🗑
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| show | a service or a program to look up information in the DNS
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| show | a group of 8 binary bits. It is similar to
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| show | International standardization program created by ISO and ITU-T to develop standards for data networking that facilitate multivendor equipment interoperability
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| Optical time domain reflectometer | show 🗑
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| Organizational Unique Identifier | show 🗑
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| overhead | show 🗑
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| show | when used generically
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| Packet Tracer | show 🗑
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| show | a part of the ethernet frame that fills in the data field to ensure that the data field meets the minimum size requirement of 46 bytes.
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| show | a host or node that participates in some form of a group. For example
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| show | a data link layer address
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| physical media | show 🗑
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| physical network | show 🗑
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| show | the arrangement of the nodes in a network and the physical connections between them. This is the representation of how the media is used to connect the devices.
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| ping sweep | show 🗑
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| show | defines which wires in a cable should connect to each pin on the connectors on both ends of a cable. For example
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| show | In a web browser
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| show | In networking
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| positional notation | show 🗑
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| post office protocol | show 🗑
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| show | in IP subnetting
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| show | a routing feature in which frames in an interface output queue are prioritized based on various characteristics such as packet size and interface type.
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| show | define in RFC 1918
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| show | a written specification that defines what tasks a service or device should perform. Each protocol defines messages
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| protocol data unit | show 🗑
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| show | a delineation of networking protocols and standards into different categories
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| proxy arp | show 🗑
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| show | a 1-bit flag in the TCP header that is used to request to the higher layers for immediate delivery of the packet.
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| show | an IP address that has been registered with IANA or one of its member agencies
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| pulse amplitude modulation | show 🗑
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| show | a control mechanism that can provide different priorities to different users or data flows
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| query | show 🗑
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| show | radio frequencies that creat noise that interferes with information being transmitted across unshielded copper cabling.
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| radix | show 🗑
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| show | a network architecture designed to eliminate network downtime cause by a single point of failure.
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| show | organizations that are responsible for the allocation and registration of Internet number resources within a particular region of the world. These registries include the American Registry for Internet Number for North America; RIPE network coordination ce
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| show | using values between 1024 and 49
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| Requests for Comments | show 🗑
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| show | the IPv4 multicast addresses 224.0.0.0 to 224.0.0.255. These addresses are to be used for multicast groups on a local network. Packets to these destinations are always transmitted with a TTTL value of 1
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| resource records | show 🗑
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| show | a rectangular cabling connector with eight pins
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| show | the time required for some network pdu's to be sent and received
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| router | show 🗑
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| show | a network device
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| routing | show 🗑
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| show | a protocol used between routers so that they can learn routes to add to their routing tables.
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| show | a list of router holds in memory for the purpose of deciding how to forward packets.
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| show | a 1-bit flag in the TCP header that is used to request that a connection be re-established.
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| runt frame | show 🗑
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| show | the ability of a protocol. system or component to be modified to fit a new need.
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| scheme | show 🗑
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| scope | show 🗑
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| show | 1. a collision domain that is a section of a LAN that is bound by bridges
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| segmentation | show 🗑
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| selective forwarding | show 🗑
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| server | show 🗑
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| show | an application level network protocl mainly applied to shared access to files
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| session | show 🗑
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| shielded twisted pair cable | show 🗑
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| signal | show 🗑
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| smtp | show 🗑
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| show | a system of network design characterized by one or more major components that are required to maintain operation.
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| slash format | show 🗑
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| show | the minimum time a NIC or interface can take to send an entire frame. Slot time
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| show | the origin of the PDU. This can be a process a host or a node
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| show | the IP address of the originating host that is placed into the IP packet header.
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| show | an internationally recognized definition of technical specifications that ensure worldwide consistency.
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| static route | show 🗑
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| store and forward | show 🗑
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| subnet | show 🗑
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| show | a dotted decimal number that helps identify the structure of IP addresses. The mask represents the network and subnet parts of related IP addresses with binary 1s and the host part of related IP addresses with binary 0s
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| switch | show 🗑
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| show | the table used by a switch that associates MAC addresses with the outgoing port. A general term for the table that a LAN bridge uses for its forwarding/filtering decisions. The table holds a list of MAC addresses and the port out which the bridge should f
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| symmetric switching | show 🗑
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| SYN | show 🗑
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| synchronous | show 🗑
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| syntax | show 🗑
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| show | a layer 4 protocl of TCP/IP model
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| TCP/IP | show 🗑
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| test-net address | show 🗑
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| show | a common term for 10base5 ethernet
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| show | a common term for 10base2 ethernet
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| show | the actual data transfer rate between two computers at some point in time. Throughput is impacted by the slowest-speed link used to send data between the two computers
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| Time to live | show 🗑
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| show | an access method used with some LAN technologies by which devices access the media in a controlled manner. This access to the LAN is managed using a small frame called a toke. A device can send only when it has claimed the use of the token.
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| show | a command on many computer operating systems that discovers the IP addresses
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| show | the learning of source addresses on incoming frames and adding them to the bridging table. After the table has been completed and when a frame is received on one of the bridge's interfaces
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| show | a general type of cable
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| show | a 1-bit flag in the TCP header used to indicate that the receiving host should notify the destination process to do urgent processing.
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| show | the limited CLI mode where the commands available to the user are a subset of those available at the privileged level. In general
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| virtual circuit | show 🗑
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| show | a network of computers that behave as if they are connected to the same network segment
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| show | the reference to text based logical interfaces on an ios device. These are accesses using telnet or ssh to perform administrative tasks. VTY lines are also called virtual type terminal.
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| show | used by tcp or udp
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| window size | show 🗑
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Review the information in the table. When you are ready to quiz yourself you can hide individual columns or the entire table. Then you can click on the empty cells to reveal the answer. Try to recall what will be displayed before clicking the empty cell.
To hide a column, click on the column name.
To hide the entire table, click on the "Hide All" button.
You may also shuffle the rows of the table by clicking on the "Shuffle" button.
Or sort by any of the columns using the down arrow next to any column heading.
If you know all the data on any row, you can temporarily remove it by tapping the trash can to the right of the row.
To hide a column, click on the column name.
To hide the entire table, click on the "Hide All" button.
You may also shuffle the rows of the table by clicking on the "Shuffle" button.
Or sort by any of the columns using the down arrow next to any column heading.
If you know all the data on any row, you can temporarily remove it by tapping the trash can to the right of the row.
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